AASTRA 6700i series, 9143, 9480i, 9480i CT SIP Administrator Guide EN - Manual (Page 384)

41-001343-01 Rev 03, Release 3.2.2 5-107
Incoming Intercom Calls
You can configure how the phone handles incoming intercom calls. You can receive incoming
intercom calls whether or not there are active calls on the phone. The way the phone handles the
call depends on the incoming intercom call configuration. The following paragraphs describe the
configuration parameters for incoming intercom calls.
Microphone Mute
You can mute or unmute the microphone on the IP phone for intercom calls made by the
originating caller. If you want to mute the intercom call, you enable this feature. If you want to
unmute (or hear the intercom call), you disable this feature.
Auto-Answer/Play Warning Tone
The auto-answer feature on the IP phone allows you to enable or disable automatic answering for
an Intercom call. If “Auto-Answer” is enabled, the phone automatically answers an incoming
intercom call. If “Play Warning Tone” is also enabled, the phone plays a tone to alert the user
before answering the intercom call. If “Auto-Answer” is disabled, the phone treats the incoming
intercom call as a normal call.
“Delay” before Auto-Answer
The IP Phones include support for the "delay" parameter (in the Alert-Info header, used in
conjunction with info=alert-autoanswer) in order to facilitate auto-answer functionality. When
present, the value of the "delay" parameter specifies the length of time in seconds an IP phone
rings before a call is auto-answered. If this value of the "delay" parameter set to 0 (delay=0), then
an incoming call is immediately auto-answered. The absence of the parameter is considered as ring
forever.
In order for the delay functionality to operate, you must first enable Auto-Answer on the IP Phone.
Allow Barge In
You can configure whether or not the IP phone allows an incoming intercom call to interrupt an
active call. The “sip intercom allow barge in” parameter controls this feature. When you enable
the sip intercom allow barge in parameter
(1 = enable in the configuration files), which is the default value, an incoming intercom call takes
precedence over any active call, by placing the active call on hold and automatically answering the
intercom call. When you disable this parameter (0 = disable in the configuration files), and there is
an active call, the phone treats an incoming intercom call like a normal call and plays the call
warning tone. You can set this parameter using the configuration files or the Aastra Web UI.